When a respectable superintendent kills his wife, the CIB are called in to investigate what looks like a straightforward case. However, Clark is not so sure.
Government Minister Nicholas Shaw has a reputation of attacking the Met. When pictures of him frolicking with his secretary are leaked to the press Clark is brought into investigate his protection officer for corruption.
After a visit from Special Branch the tape of 'a certain Royal Conversation' goes missing from a journalist's desk. He police and/or MI5 are accused of the theft.